Improvement in middlings-purifiers



' 2Sheets--Sheet.

L. GATH MANN. T

Y Middlings-.Puriiiers- No.l49,850. PatentedApril21,1a74.

ATTEST:

LOUIS GATHMANN, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN MIDDLINGS-PURIFIERS.

Specification forming part of Letters Patent No. 149,850, dated April2l, 1874; application led February 7, 1874.

T0 all whom it may concern:

Be it known that I, LoUIs GATHMANN, of Chicago, in the county of Cookand State of Illinois, have invented an Improvement in Middlings-Puriiers, of which the following is a specification j The nature ofthis invention relates to a machine having for its object, first, toseparate the iine flour from the middlings, secondly, the separation ofthe line from the coarse middlin gs; thirdly, the elimination of thedust and impurities, and the subsequent separation of the offal from thepurified middlings. The invention consists in the peculiar constructionof the machine in its several parts, as more fully hereinafter setforth.

Figure 1, Sheet l, is a perspective view. Fig. 2 is a cross-section ofthe vibrating screen-frame on @0 Figi. Fig. 3 is an enlarged detail inelevation of the eccentric on the fan-shaft, and its frame for vibratingthe screen-frame. Fig. 4, Sheet 2, is a central longitudinal section ofthe machine. Fig. 5 is a cross-section at y y, Fig. 4. Fig. 6 .is adetail elevation of the knocker-bar and its actuating crank-pin.

In the drawing, A represents the frame and external casing of themachine, with a hopper, A', at the upper rear corner, through which theunpurified middlings are fed in, the iniiuent stream being divided andreceived bythe ends of the bolting-cloth-covered screens B B B, whichproject into the hopper, the volume to each screen being regulated, orshut ofi' altogether, by slide-boards a a a, if one or more of saidscreens be removed from the frame D. The screens are inclined to thefront, and underneath eachis a sheetmetal returning-board, C C C,inclined in the opposite direction, being also longitudi-` nally archedto throw the material passing through the screens to the sides, passingout journaled. On each side of the blower-case an eccentric, c, issecured to the shaft. A yoke-frame, d, embraces the eccentric, and isconnected, by the rod e, to one side of the frame D, to vibrate the saidframe longitudinally on its supports, the other eccentric beingconnected in like manner to the other side of said frame. The front endof the casing is closed by a door, in which are hung several adjustableblind-slat valves, f, to regulate the iniiuX of air to the fan throughthe casing. The middlings fall from the tail of the lower screen uponshort inclines G, pitched in opposite directions, at the front of themachine, falling from incline to incline, while the suction of the fanwill draw away the lighter stuff, the heavier falling perpendicularly,to be caught by the projecting lip from the edge' of the next inclinebelow. These inclines are adjustable as to the angle of inclination tosuit the varying grades of grain being ground. The heavy or clean coarsemiddlings are deposited upon a coarse-meshed screen, H, inclined to therear, to be sifted. All that passes through drops on a board, whichleads it to a side discharge-opening, I, while the coarse oii'al andshorts passing over the tail of said screen H are discharged at K, andall the specks and light furze are drawn back by the fan and dischargedthrough its spout L. By means of valve-openings in the sides of thecasing, part of the air drawn in by the fan may be caused to enterthrough these side openings, and pass upward through the three upperscreens, to prevent the light line stuff from passing down through thesescreens, the balance of the suction being taken through the valves inthe front of the casing. At 'one side of the frame and casin g is avertical rod, M, with a horizontal knockerbar, h, to pass under eachscreen, being pivoted to the casing at the point where it passesthrough, its inner end striking underneath the middle stile of theframe. At the lower end of the rod M a spring, fi, is attached, to pullit down forcibly when free to drop, and thus cause the knocker-bars tostrike a smart blow. The lifting of the knockerrod M is accomplished bya crankpin, k, on the side of a disk, N, passing, under a toe, l, on therod J@he frame D, with relation to the hopper A M. The disk N is mountedou a, shaft or and spouts E I K in the easing A, subsmu stud, m, at; theside of the easing, and on the tially as und for' the purposes setforth.

same sleeve is a pulley, O, driven by a crossbelt, P, from thefan-shaft. LOUIS GATHMANN' I eluim- Witnesses:

The arrangement of the screens B, B', B, y WM. H. LOTZ,. and H, and theinnings e of e" G G G G in ARTHUR, P, JOY.

